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Title: Assessing the specific energy consumption and physical properties of comminuted Douglas-fir chips for bioconversion

Source: Industrial Crops and Products Vol. 94: 394-400.

Author(s)Liu, Yalan; Wang, Jinwu; Wolcott, Michael P.

Publication Year: 2016  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-3B

Abstract: Size reduction homogenizes the bulk biomass and facilitates downstream feedstock handling, transportation, and storage. Effects of feeding rate, mill-type (hammer and knife mill), screen size, and moisture content on comminution energy consumption of commercial Douglas-fir (Pseudotsuga menziesii) pulp chips were quantified. The resulting particles were characterized by geometric mean diameter, size distribution, aspect ratio and bulk density. We also employed scanning electron microscopy (SEM) to visualize the dominant fracture surface features. A linear regression was used to describe the relationship between specific energy consumption (SEC) and comminution ratio, which can be used for estimating the SEC of various particle sizes of feedstock. Results demonstrated that with a screen size of 3.18 mm, the hammer mill consumed 345 kJ kg -1. Selecting the feeding rate, which allows the machine reach its rated power, can result in lowest total SEC. SEC also increased substantially with an increase in moisture content from 11% to 17% (fraction in total mass basis). Analysis of the particle morphology revealed that the dominant fracture mechanism was across lumen for hammer milling and along middle lamella for knife milling.

Keywords: Size reduction, Comminution ratio, Feeding rate, Geometric mean diameter, Fracture mechanism

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 12/23/2016

This publication is also viewable on Treesearch:  view
RITS Product ID: 83787
Current FPL Scientist associated with this product
Wang, Jinwu
Research Forest Products Technologist
  

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